From b199368c19bdc5f1b5f0fc991473ae7de3f73d31 Mon Sep 17 00:00:00 2001
From: Shern Tee <shernren@gmail.com>
Date: Thu, 14 Dec 2023 10:46:32 +1000
Subject: [PATCH] add extract function to fix_property_atom

---
 src/fix_property_atom.cpp | 24 ++++++++++++++++++++++++
 src/fix_property_atom.h   |  1 +
 2 files changed, 25 insertions(+)

diff --git a/src/fix_property_atom.cpp b/src/fix_property_atom.cpp
index 9613523059..1e004ae4cb 100644
--- a/src/fix_property_atom.cpp
+++ b/src/fix_property_atom.cpp
@@ -948,3 +948,27 @@ int FixPropertyAtom::size_restart(int /*nlocal*/)
 {
   return values_peratom + 1;
 }
+
+/* ----------------------------------------------------------------------
+   extract fix property/atom properties
+------------------------------------------------------------------------- */
+
+void *FixPropertyAtom::extract(const char *str, int &dim)
+{
+  dim=0;
+  if (strcmp(str, "nvalue") == 0) {
+    return &nvalue;
+  } else if (strcmp(str, "border") == 0) {
+    return &border;
+  }
+  dim=1;
+  if (strcmp(str, "styles") == 0) {
+    return &styles;
+  } else if (strcmp(str, "index") == 0) {
+    return &index;
+  } else if (strcmp(str, "cols") == 0) {
+    return &cols;
+  }
+  return nullptr;
+}
+
diff --git a/src/fix_property_atom.h b/src/fix_property_atom.h
index c50b6049dc..820acf3a20 100644
--- a/src/fix_property_atom.h
+++ b/src/fix_property_atom.h
@@ -51,6 +51,7 @@ class FixPropertyAtom : public Fix {
   void unpack_restart(int, int) override;
   int size_restart(int) override;
   int maxsize_restart() override;
+  void *extract(const char *, int &) override;
   double memory_usage() override;
 
  protected: